This could get a bit repetitive - Any I have changed or added in CAPS (no, I'm not shouting!) And there's a we bit o tongue in cheek with some!

Jenny Grays Whisky.
Rosebud in June
Sailors Lament
Little Pot Stove -SCOTTISH/AUSTRALIAN (Harry Robertson)
Shoals of Herring - SALFORD/??SCOTTISH/Locations mainly English
RossTrawlers Return
Mingulay Folk Song - Scottish
The Water is Wide - AMERICAN/ENGLISH/IRISH/SCOTTISH
If I was a blackbird
Lovers Lullaby
Somewhere along the road - ENGLISH
Green Fields of France - SCOTTISH/AUSTRALIAN
The Town I loved so well - Irish
Both sides the Tweed - Scottish
Jock o’ Hazeldean - Scottish
The Parting Glass - FIRST KNOWN VERSION IS SCOTTISH!
Sammys Bar - MALTESE? Cyril Tawney
Universal Soldier - SCOTTISH - DONOVAN
Rose of Allendale - NORTHUMBRIAN
Kelvingrove - SCOTTISH (GLASGOW)
You’ve got a friend - American
Valeries a Woman
Windmills - LANCASHIRE, ENGLISH
Wild Mountain Thyme - Scottish
The Best is yet to come
When all is said and done - IRISH? Only heard it by Danu
Song for Ireland - Irish but WRITTEN BY AN ENGLISHMAN
The trees they do grow high.
Must I be bound
Curragh of Kildare - Irish, BUT BASED ON A SCOTTISH (BURNS)SONG
Glorious Ale.
Rosemary Lane
I need you to turn to
The little Piercer - Lancashire :-D
Hope has a Place
Long long before your time.
Grace
I will love you. TOM PAXTON - AMERICAN - if you mean that one the Fureys also did?
Fhear a Bhata. - Irish? NO, SCOTTISH GAELIC
The Little Piercer. - A repeat